thin-provisioning-tools/metadata_dumper.cc

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// Copyright (C) 2011 Red Hat, Inc. All rights reserved.
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//
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// This file is part of the thin-provisioning-tools source.
//
// thin-provisioning-tools is free software: you can redistribute it
// and/or modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation, either version 3 of
// the License, or (at your option) any later version.
//
// thin-provisioning-tools is distributed in the hope that it will be
// useful, but WITHOUT ANY WARRANTY; without even the implied warranty
// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with thin-provisioning-tools. If not, see
// <http://www.gnu.org/licenses/>.
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#include "metadata_dumper.h"
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using namespace persistent_data;
using namespace thin_provisioning;
//----------------------------------------------------------------
namespace {
class mappings_extractor : public btree<2, block_traits>::visitor {
public:
typedef boost::shared_ptr<mappings_extractor> ptr;
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typedef btree_checker<2, block_traits> checker;
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mappings_extractor(uint64_t dev_id, emitter::ptr e,
space_map::ptr md_sm, space_map::ptr data_sm)
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: counter_(),
checker_(counter_),
dev_id_(dev_id),
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e_(e),
md_sm_(md_sm),
data_sm_(data_sm),
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in_range_(false),
found_errors_(false) {
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}
bool visit_internal(unsigned level, bool sub_root, boost::optional<uint64_t> key,
btree_detail::node_ref<uint64_traits> const &n) {
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if (!checker_.visit_internal(level, sub_root, key, n)) {
found_errors_ = true;
return false;
}
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return (sub_root && key) ? (*key == dev_id_) : true;
}
bool visit_internal_leaf(unsigned level, bool sub_root, boost::optional<uint64_t> key,
btree_detail::node_ref<uint64_traits> const &n) {
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if (!checker_.visit_internal_leaf(level, sub_root, key, n)) {
found_errors_ = true;
return false;
}
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return true;
}
bool visit_leaf(unsigned level, bool sub_root, boost::optional<uint64_t> maybe_key,
btree_detail::node_ref<block_traits> const &n) {
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if (!checker_.visit_leaf(level, sub_root, maybe_key, n)) {
found_errors_ = true;
return false;
}
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for (unsigned i = 0; i < n.get_nr_entries(); i++) {
block_time bt = n.value_at(i);
add_mapping(n.key_at(i), bt.block_, bt.time_);
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}
return true;
}
void visit_complete() {
end_mapping();
}
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bool corruption() const {
return !checker_.get_errors()->empty();
}
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private:
void start_mapping(uint64_t origin_block, uint64_t dest_block, uint32_t time) {
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origin_start_ = origin_block;
dest_start_ = dest_block;
time_ = time;
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len_ = 1;
in_range_ = true;
}
void end_mapping() {
if (in_range_) {
if (len_ == 1)
e_->single_map(origin_start_, dest_start_, time_);
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else
e_->range_map(origin_start_, dest_start_, time_, len_);
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in_range_ = false;
}
}
void add_mapping(uint64_t origin_block, uint64_t dest_block, uint32_t time) {
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if (!in_range_)
start_mapping(origin_block, dest_block, time);
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else if (origin_block == origin_start_ + len_ &&
dest_block == dest_start_ + len_ &&
time == time_)
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len_++;
else {
end_mapping();
start_mapping(origin_block, dest_block, time);
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}
}
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// Declaration order of counter_ and checker_ is important.
block_counter counter_;
checker checker_;
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uint64_t dev_id_;
emitter::ptr e_;
space_map::ptr md_sm_;
space_map::ptr data_sm_;
bool in_range_;
uint64_t origin_start_, dest_start_, len_;
uint32_t time_;
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bool found_errors_;
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};
class details_extractor : public btree<1, device_details_traits>::visitor {
public:
typedef boost::shared_ptr<details_extractor> ptr;
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typedef btree_checker<1, device_details_traits> checker;
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details_extractor()
: counter_(),
checker_(counter_, false) {
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}
bool visit_internal(unsigned level, bool sub_root, boost::optional<uint64_t> key,
btree_detail::node_ref<uint64_traits> const &n) {
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return checker_.visit_internal(level, sub_root, key, n);
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}
bool visit_internal_leaf(unsigned level, bool sub_root, boost::optional<uint64_t> key,
btree_detail::node_ref<uint64_traits> const &n) {
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return checker_.visit_internal_leaf(level, sub_root, key, n);
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}
bool visit_leaf(unsigned level, bool sub_root, boost::optional<uint64_t> maybe_key,
btree_detail::node_ref<device_details_traits> const &n) {
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if (!checker_.visit_leaf(level, sub_root, maybe_key, n))
return false;
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for (unsigned i = 0; i < n.get_nr_entries(); i++)
devices_.insert(make_pair(n.key_at(i), n.value_at(i)));
return true;
}
map<uint64_t, device_details> const &get_devices() const {
return devices_;
}
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bool corruption() const {
return !checker_.get_errors()->empty();
}
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private:
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// Declaration order of counter_ and checker_ is important.
block_counter counter_;
checker checker_;
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map<uint64_t, device_details> devices_;
};
}
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//----------------------------------------------------------------
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void
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thin_provisioning::metadata_dump(metadata::ptr md, emitter::ptr e, bool repair)
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{
e->begin_superblock("", md->sb_.time_,
md->sb_.trans_id_,
md->sb_.data_block_size_,
md->data_sm_->get_nr_blocks());
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details_extractor::ptr de(new details_extractor);
md->details_->visit(de);
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if (de->corruption() && !repair)
throw runtime_error("corruption in device details tree");
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map<uint64_t, device_details> const &devs = de->get_devices();
map<uint64_t, device_details>::const_iterator it, end = devs.end();
for (it = devs.begin(); it != end; ++it) {
uint64_t dev_id = it->first;
device_details const &dd = it->second;
e->begin_device(dev_id,
dd.mapped_blocks_,
dd.transaction_id_,
dd.creation_time_,
dd.snapshotted_time_);
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mappings_extractor::ptr me(new mappings_extractor(dev_id, e, md->metadata_sm_, md->data_sm_));
md->mappings_->visit(me);
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if (me->corruption() && !repair) {
ostringstream out;
out << "corruption in mappings for device " << dev_id;
throw runtime_error(out.str());
}
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e->end_device();
}
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e->end_superblock();
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}
//----------------------------------------------------------------